Air Brakes #1
Air Brakes Endorsement Test | Wisconsin 2025 #1 Page 4 of 4
Train for FREE online with our Wisconsin CDL air brake test. The official exam test consists of several obligatory parts, with all of them checking your knowledge of different blocks of road rules. If you need to obtain a WI Class A/Class B driver license in 2025, practice as much as possible. Free sample tests published on our website will help you check and improve your knowledge and boost your grades. Please bear in mind that the requirements for CDL may vary from state to state.
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19 . To ensure normal stopping power, drivers of vehicles equipped with a front brake limiting valve should:
Some older vehicles have front brake limiting valves with "normal" and "slippery" settings. Setting a brake limiting valve to "slippery" reduces the vehicle's stopping power, so a driver should make sure the valve is in its "normal" position. Front wheel braking has proven to be effective in all driving conditions.
20 . In a dual air brake system:
There are two air brake systems in a dual air brake system. The systems share a set of brake controls, but each system has its own tanks, hoses, and lines.
21 . Why do you need to drain air tanks regularly?
To remove bad air from the tanks
Compressed air in an air brake system usually contains a certain amount of water and compressor oil. The water and oil can damage the brakes if left to accumulate in the system. Tanks must be drained regularly to remove this build-up.
22 . A tank endorsement is:
Optional when transporting hazardous materials.
In general, a tank endorsement is required to a drive tank vehicle used to transport liquids or gases. This applies to both hazardous and non-hazardous materials.
23 . If the low pressure warning light comes on while you are driving:
You should continue driving, but turn the emergency flashers on to warn other motorists.
If the low air pressure warning light turns on, you should stop and safely park your vehicle as soon as possible. Controlled braking will be possible only as long as enough air remains in the tanks.
24 . Truck tractors with air brakes that were built on or after March 1, 1997 are equipped with:
Anti-Lock Braking Systems (ABS).
Truck tractors with air brakes that were manufactured on or after March 1, 1997 are required to be equipped with Anti-Lock Braking Systems (ABS). ABS is required in any other type of vehicle with air brakes that was manufactured on or after March 1, 1998.
25 . Braking mechanisms are located inside:
Drum brakes are attached to the wheels and located on the axles of a vehicle. The braking mechanisms that cause the vehicle to stop can be found inside of a drum brake.
2025 Wisconsin | Frequently Asked Questions
A CDL Class A license in Wisconsin allows holders to operate any combination of vehicles with a Gross Combination Weight Rating (GCWR) of 26,001 pounds or more, provided the vehicle(s) being towed are over 10,000 pounds. This includes tractor-trailers, truck and trailer combinations, and flatbeds. The license also requires specific endorsements for certain types of vehicles.
A Class A CDL license in Wisconsin allows the holder to operate vehicles such as tractor-trailers, truck and trailer combinations, tank vehicles, livestock carriers, and flatbeds. These are typically vehicles with a Gross Combination Weight Rating (GCWR) of 26,001 lbs or more, where the vehicle being towed weighs more than 10,000 lbs.
To obtain a Class A CDL license in Wisconsin, applicants must be at least 18 years old (21 for interstate driving), possess a valid Wisconsin driver's license, pass a vision test, and successfully complete a general knowledge test. They must also pass skills tests, including a pre-trip vehicle inspection, basic vehicle control, and on-road driving. Medical examinations may also be required.
In Wisconsin, you must be at least 18 years old to qualify for a Class A Commercial Driver's License (CDL) for intrastate driving (within Wisconsin only). However, to drive a commercial vehicle across state lines (interstate driving), you must be at least 21 years old.
Endorsements are not required for a Class A CDL license, but they can provide additional driving privileges. These include T (Double/Triple Trailers), P (Passenger), N (Tank vehicles), H (Hazardous materials), and S (School Bus). Each endorsement requires passing specific knowledge tests, and some may require additional skills tests. It's important to get the endorsements that match your job requirements.
The Class A CDL skills test in Wisconsin encompasses three main areas: a pre-trip vehicle inspection to ensure the vehicle is safe to drive, a basic vehicle control test to demonstrate your ability to maneuver and control the vehicle, and an on-road driving test where you'll be tested on a variety of traffic situations and road conditions.
Yes, Class A CDL license holders in Wisconsin may face limitations depending on their specific circumstances. For instance, if the driver doesn't pass the air brake portion of the test, they get an "L" restriction and can't operate vehicles with air brakes. Additionally, drivers under 21 are restricted to intrastate operation. Also, certain medical conditions may impose restrictions.
Yes, in Wisconsin, the written Class A CDL test is available in English, Spanish, and Hmong. However, applicants should note that all CDL applicants must be able to read and understand English well enough to converse with the general public, understand highway traffic signs and signals, respond to official inquiries, and make entries on reports and records.
Yes, Wisconsin's Department of Transportation (WisDOT) is committed to providing accessible services. If you have a disability and require accommodations for the Class A CDL written test, you can make a request. Accommodations may include additional time, a separate testing room, or the use of special equipment. It's recommended to make the request as early as possible.
Yes, you can retake the Class A CDL written test in Wisconsin if you don't pass on your first attempt. However, you may have to wait one day before retaking the test. There might also be additional fees for each retest. It's recommended that you review the areas you struggled with before attempting the test again.